JPH067913A - Heat insulating die for die casting - Google Patents

Abstract

PURPOSE:To reduce waste shots for raising temp. of a die to a half and to improve the productivity by using the die for die casting having structure, in which a heat insulating material is embedded in a part thereof to prevent the heat of the die from radiation through heat conduction of die plates. CONSTITUTION:Heat insulating groove holes 9 are newly arranged in solid parts of a fixed die part 8 and a movable die part 7. The heat insulating material 'Kaol', etc., into this newly arranged groove holes 9 is embedded and the warming up of waste shot is started. By this method, the temps. of a fixed nesting 3 and a movable nesting 6 heated by molten metal 1 filled into a product part 2 are raised. In this case, the conduction and radiation of the heat from the molten metal 1 becomes very little by the effect of the heat insulating material, and as the conduction of the heat to the fixed die plate 4 and the movable die plate 5 is shut off, mass productive temp. can be raised at <=5 shots the number of waste shots. By this method, the service life of the die is extended caused by relaxation of cooling and heating cycle of the die.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a structure for embedding a heat insulating material in a part of a die casting mold.

[0002]

2. Description of the Related Art A conventional die casting die is an assembly of steel products.

When mass production is carried out with this mold, warming-up scrap shots for filling the cavity with molten metal are repeated.

In order to raise the mold temperature to a specified temperature at which mass production is possible, 10 to 20 shots are discarded, which is a bottleneck for improving productivity.

This is because steel is excellent in thermal conductivity and escapes along the surface in contact with the die casting machine. By preventing this, the half ratio of waste shot is expected.

[0006]

In the conventional mold structure,
All of the inserts that form the product part, the assembly structure part, and the attached parts such as the extruded plate are of steel structure and have excellent thermal conductivity.
Moreover, the mounting surface is in surface contact with the die plate on the die casting machine.

As a method of applying heat to the mold for preheating,
The mold temperature is raised by the amount of heat obtained by filling the molten metal in the cavity, but many escape from the above structure to unnecessary parts, significantly reducing the temperature rise effect of the product cavity. It was

It is an object of the present invention to improve the thermal efficiency and reduce the warm-up waste shot in half.

[0009]

[MEANS FOR SOLVING THE PROBLEMS] In order to raise the temperature of a mold to a specified temperature for mass production, a molten metal filling operation is repeated.

The amount of heat obtained from this molten metal serves as a heat source, and it is important to effectively secure it in a necessary portion.

For this reason, a buried groove such as a heat insulating material is newly provided on the back surface of the mold, and a heat insulating material such as a caster is buried in this groove before warm-up and throwing away to prevent heat from escaping to unnecessary portions.

As a result, the conventional warm-up discard shot is halved. In this case, this heat insulating material is unnecessary after mass production, so it has a simple structure for attachment and detachment.
It is supposed to be removed.

[0013]

In the die casting mold, most of the parts such as the product insert, the movable mold part, the fixed mold part and the extruded plate are steel processed parts assembled together, and are excellent in heat conduction.

Therefore, as the heat source for raising the die temperature to a mass production range, the amount of heat from the aluminum which is repeatedly filled with the molten metal in the product cavity is utilized.

However, in this case, the conduction heat to the mold and the conduction to the die plate are large, and the rate of being effectively utilized for raising the temperature of the necessary portion is low.

As a result, the 10-shot to 20-shot waste shot warm-up is performed.

According to the present invention, a heat insulating material incorporating groove is newly provided in a part of the fixed mold portion and the movable mold portion, and the heat insulating material caor or the like is embedded at the time of warming up and discarding the temperature of the mold so as to waste heat. Conduction is reduced and it is effectively used for the necessary product insertion cavity, and by increasing the temperature rising speed, the number of discarded shots is reduced to 5 or less, which contributes to productivity improvement.

[0018]

The structure and mechanism of the present invention will be described below.

FIG. 1 shows a conventional mold structure, in which a molten metal 1 is repeatedly used as a heat source to fill a product part 2 so that the temperatures of a fixed mold insert 3 and a movable mold insert 6 are mass-produced. Warm-up discard shots are being performed to raise to the maximum possible range.

However, in this case, the number of discarded shots is extremely large from 10 shots to 20 shots or more, and this work is performed whenever the work is stopped for a long time, which significantly impairs the productivity.

This requires a preventive measure, but it is impossible to completely eliminate it with the current technical capabilities. Therefore, in order to reduce the heat transfer efficiency by paying attention to reducing this warm-up discard shot. Has invented a method of embedding caol or the like having a heat insulating effect in a part of a mold at the time of warming up.

FIG. 2 shows the mold structure.

As a feature of this, a groove or a hole is newly provided in the space of the fixed mold part 8 and the movable mold part 7 as shown in FIG.

Insulating material such as caor is embedded in the newly provided groove or hole, and warm-up discard shot is started.

By this, the molten metal 1 filled in the product portion 2
The temperature of the fixed mold insert 3 and the movable mold insert 6 heated by the temperature rises.

In this case, the conduction and release of heat from the molten metal 1 becomes extremely small due to the effect of the heat insulating material, and the escape of heat to the fixed die plate 4 and the movable die plate 5 is also cut off. Since the temperature can be raised to the temperature at which mass production is possible in shots or less, a significant improvement in production efficiency is expected.

It is to be noted that the heat insulating material is characterized in that it can be easily attached and detached in the same shape as the groove and hole.

[0028]

【The invention's effect】

(1) It is possible to halve the warm-up throw-up shot for raising the die temperature to a mass production range, and it is possible to significantly improve the productivity.

(2) The life of the mold is expected to be extended because the temperature difference can be mitigated at the time of warm-up and scrap shot in a severe mold cooling / heating cycle.

[Brief description of drawings]

FIG. 1 is a cross-sectional view of a conventional mold structure.

FIG. 2 is a sectional view of a mold structure according to an embodiment of the present invention.

[Explanation of symbols]

 7 ... Movable mold part, 8 ... Fixed mold part.

Claims (1)

[Claims] 1. A die for producing a die-cast product, which has a structure in which a heat insulating material is embedded in a part thereof to prevent heat of the die from escaping through the die plate. Die casting mold.